Compressor regulator



May s, 1924. 1,493,064

R. M. BRASINGTON COMPRESSOR REGULATOR Filed Aug. 22 1922 2 SheetsK-Sheet 1 May 6, 1924. A 1,493,064

R. M. BRASINGTON COMPRES S OR REGULATOR F1165 Augfzz. 1922 2 sheets-sheet P after/mug Patented May 6, 1924.

UNITED STATES Ross M. BRAsrlire'rou,Y ORMARIETTA, OHIO.

COMPRESSOR REGULATOR. j

Application filed August 22, 1922. Serial No. 583,481.

To all whom t may concern:

Be it known that I, Ross M.'BRAs1NGToN, a citizen of the United States, residing at Marietta, in the county of Washington and State of Ohio, have invented new and useful Improvements in `Compressor Regulators, of

shaped and is designed to exert at all times which the following is a specification.

The object of my said invention isto improve compressor regulators by the provision of means sufficiently strong to overcome the friction caused by the needle valve sticking in its seat and to raise the said valve when a certain predetermined pressure is attained.

To the attainment of the foregoing, the invention consists in the improvement as hereinafter described and denitely claimed.

In the accompanying drawings, forming part of this specification Figure 1 is a vertical section of a `com presor regulator embodying my improvemen Figure 2 is an enlarged detail section' showing a slight modification of my invention.

Figure 3 is a horizontal section taken in the plane indicated by the line 3-3 of Figure 2, looking downwardly.

The compressor regulator illustrated comprises in its upper portion a casing 1 having an arm 2 for connection with a compressor and also having relief means 3. The arm 2 is in communication with a chamber 4, and the relief means 3 is in communication with a chamber 5 below .which is a piston cylinder 6 and a spring pressed piston 7. The lower part of the construction of the compressor may be as illustrated in Figure 1 or may besimilar in construction lto the compressor' regulator disclosed inthe patent to one Wainwright 1,366,853 of January 25,

1921. It will also be noted by reference tol Figure 1 that a piston 8 is movable in the casing 1 and is backed by a spring 9 which in turn is backed by a screw 10 threaded in the upper end portion of the casing. This structure is common to that of the patent cited as is also the apertured valve seat 11 by which communication is effected between the chambers 4 and 5.

Carried by the piston 8 and extending downwardly therefrom is a needle valve 12 for cooperation with the valve seat 11. The said needle valve 12 is preferably headed at 13 and secured to the piston 8 through the medium of an annular nut 14 as illustrated.

In accordance with my invention a coiled lspring-15 is=interposed between the piston '8 andthe bottom wall of the chamberi, the said spring 15 being shown in the illustrated embodiment asbearingy against the nut 14 which is flanged at its lower end.

AMy Inovel spring 15 is preferably cone an upward pressure on the piston 8. The said'springl is considerably weaker than the tension spring 9, but is sufficiently strong to overcome the friction due to the tendency of the needle'valve 12 to'stick in itsy seat.

` The practical advantage of thespring 15 relatively arranged las described will be better understood when it is stated by way of example that lwhen'it is desired to carry ninety pounds of air pressure, and the needle valve is seated until said pressure is attained, the `needle Avalve instead'of unseating at said time will require for 'its unseating a number of pounds inexcessof the desired pressure which is very objectionableas is well known to those skilled in the art. In virtue ofumy improvement the spring 15 serves to open Vthe needle valve when the ydesired pressure is attainedy and this promptlyso that the apparatus is' rendered extremely sensitive.

Thel spring 15 fis so made that when valve 12 is in its upper position,` spring 15 is in va neutral state. It does not necessarily en- -gage the valve 12 in its extreme upper posi tion. During the 'descent of valve 12 to its seat', the resistance opposed by spr-ing 15 is at irstzero and is but slight until valve 12 nears its seat and is accumulated within a' short range of movement until its maximum is reached as valve 12 reaches its seat. The Iresistance of-spring 15 to the seat-ing movement of valve 12 is overfvzornev by spring 9 aided by' themomentum imparted to valve 12 :While that resistance'was, Zero `or small. The useful action of spring 15 is to prevent jamming of valve 12 by its momentum when seating and when the air pressure falls below that for which spring 9 is adjusted. kShould valve 12 leave its seat at a lower pressure than that for which spring 9 is adjusted, the eifective pressure of spring 15 would soon be lost andthe spring 9 would return the valve to its seat, upon small further reduction of pressure due to its opening, and little air would escape from the receiver in consequence. Experience vshows that the operation of the regulator is not materially affected by any such opening of valve 12 at too low pressures. t

vWhen deemed expedient the springl may be connected to the lower end of the piston 8. The connection alluded to may be and preferably is effected byextending-.the upper terminal l5X of the spring 15 through' a diainetrical aperture 16 in the needle valued-2, and the connection is advantageous inasmuch as when the piston 38 is `removed:troni-the casing, the spring will be removed with it.

Irrespective of whetherthe =spring' '15 ,is connected with the piston -8' or fnotlprefer to have the lower end of the 'springsmaller than the inside dimension 'of Vthe chamberl walls of the piston 8 so'jthat the' spring can be inserted 'without yscratching orfma'rring the said wall orfwalls." v'I Valso .pi'efer'to taper the vspring4 as illustrated vvso'. as; to obvi'ate the liability offthespringfleaning .to one side or the other.

I have-,entered into a detaileddescription of the construction and relative' arrangement of' the i parts embraced in the 'presentw-"aiii'd preferred embodiments of .my invention in order to impart a' full, clear'and exact .understanding of the saidfeinbodinients. LI do y not desire, however, to be understood` as-'con- "connection with a'piston cylinder, an apertiir'ed diaphragm betweeiifsaid '.chaiiibers, la piston infconiinunicationJ with the yirstnamed chambena spring backing s'aidfpiston', and a valve carried by saidpis'ton and adapted `to seatl in said apertured vdiaphragm; of a spring weakerwthan thefirstnamed spring surrounding the valve and interposed between-thefapertured diaphragm and the spring-backedv piston(v 2. In a compressorregulatonthe combination with a casing having' a chamber fcr connection with a compressor, a chamber `for connection with aI piston cylinder, an

apertured diaphragm between said chambers, ,a piston in, communication with the `[irst-named chamber, a spring backing said piston, and a valve carried bysaid piston and adapted toseat in said apertured diaphragm; of, aspring weaker than the firstnamed spring surrounding the valve and interposed betweenthe apertured diaphragm andvthe .spring-backed piston; the said interposed `spring being tapered upwardly.

S34/In a compressor'regulator, the combination with a casing having a chamber for connection with acompressor, a chamber for connection with kafpiston'cylinder, an apertured diaphragm between saidfchambgers, a piston Vin communication with the firsttoi'i, Tand a yvalve carried `by` said piston and adapted tn seat" in` said apertured dia- "pliragmyof a spring weaker than the first- .named spring surrounding the valve and innamed, chamber, .a spring backing said piss terposed between the lapertured diaphragm.k

iandA *the spring-backed piston; "the said Hspring being tapered y,upwardly and being connected and removable with Vthe springbacked piston andthe valve.`

.4. In combination, .an unloader valve for fluid compressors having a casing formed with apair of chan'ubers,l an'apertured diaphragm between 'said chambersya piston mounted for reciprocation in one of the cylinders, an 'expansion spring behind said piston for normally yfiorcingit toward the diaphragm` and a ypin valve carried by the piston for projecting into the aperture in 'the diaphragm forv closing said aperture againstqthe passage of fluid between the chambers; and afspring surrounding saidv pin and interposed between the. diaphragm and piston rfor overcoming the sticking action of'the pinfinthe aperture whenthe pressure of thevrfluid in the chamberis siiiiicient toovercome the'pressure of the first mentioned spring for moving'the piston and unseating the pin ffrom the aperture.

iIn testimony whereof, I aHiX my signature.

`Ross M. BRAsiNeToN. 

